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Plasma-assisted ammonia synthesis under mild conditions for hydrogen and electricity storage:Mechanisms,pathways,and application prospects

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Frontiers in Energy 2024年第4期18卷 418-435页

作者： Feng GONG Yuhang JING Rui XIAO Key Laboratory of Energy Thermal Conversion and Process Measurement and Control of the Ministry of Education School of Energy and EnvironmentSoutheast UniversityNanjing 210096China

Ammonia,with its high hydrogen storage density of 17.7 wt.%(mass fraction),cleanliness,efficiency,and renewability,presents itself as a promising zero-carbon ***,the traditional Haber−Bosch(H−B)process for ammonia synthesis necessitates high temperature and pressure,resulting in over 420 million tons of carbon dioxide emissions annually,and relies on fossil fuel *** contrast,dielectric barrier discharge(DBD)plasma-assisted ammonia synthesis operates at low temperatures and atmospheric pressures,utilizing nitrogen and hydrogen radicals excited by energetic electrons,offering a potential alternative to the H−B *** method can be effectively coupled with renewable energy sources(such as solar and wind)for environmentally friendly,distributed,and efficient ammonia *** review delves into a comprehensive analysis of the low-temperature DBD plasma-assisted ammonia synthesis technology at atmospheric pressure,covering the reaction pathway,mechanism,and catalyst system involved in plasma nitrogen *** from current research,it evaluates the economic feasibility of the DBD plasmaassisted ammonia synthesis technology,analyzes existing dilemmas and challenges,and provides insights and recommendations for the future of nonthermal plasma ammonia processes.

关键词： plasma catalysis nitrogen fixation ammonia synthesis hydrogen storage catalyst carbon neutralization

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An Unconfined Monocular Stereo-PIV measurement Method for Gas-Liquid Pipe Flow

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IEEE Sensors Journal 2025年第11期25卷 20104-20112页

作者： Wang, Haixia Xue, Ting Tianjin University Tianjin Key Laboratory of Process Measurement and Control College of Electrical and Information Engineering Tianjin300072 China

Stereo-PIV encounters intricate challenges in flow measurement, especially accurate target localization and synchronized control of dual cameras. To overcome these obstacles, a comprehensive study delves into gas-liquid two-phase flow utilizing a monocular Stereo-PIV system. To reduce the need for high-precision target localization, a method is proposed that integrates particle features for corner extraction and spatial consistency for precise matching by pyramid up-down sampling. The approach effectively mitigates scale variance-induced mismatches and facilitates accurate spatial plane reconstruction. Validation is conducted utilizing particle simulation to assess the accuracy of feature extraction and matching and their impact on spatial plane reconstruction. Furthermore, optical distortion calibration results derived from gas-liquid two-phase flow are compared with experimental data to investigate the accuracy of real plane reconstruction. The accuracy of three-dimensional velocities is evaluated across planes with various errors. Finally, three-dimensional velocity profiles are characterized within slug flow structures, thereby offering insights into velocity variation characteristics. © 2001-2012 IEEE.

关键词： Stereo image processing

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Sampled-data bipartite containment control over a network of wave equations

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Science China(Information Sciences) 2023年第9期66卷 21-34页

作者： Yining CHEN Zhiqiang ZUO Yijing WANG School of Artificial Intelligence Tiangong University Tianjin Key Laboratory of Process Measurement and Control School of Electrical and Information Engineering Tianjin University

This paper studies the bipartite containment control problem for a network of wave equations.A distributed sampled-data control protocol is proposed such that the follower states converge to a convex hull spanned by the leader trajectories and their opposites. A criterion for bipartite containment control is derived by applying the constructed Lyapunov-Krasovskii functional. The well-posedness of the closedloop system is verified using the semigroup and induction methods. Furthermore, the effectiveness of the theoretical results is demonstrated through numerical examples.

关键词： bipartite containment control sampled-data control multi-agent system partial differential equation

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Effect of applied electric fields on supralinear dendritic integration of interneuron

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Chinese Physics B 2024年第2期33卷 84-95页

作者：樊亚琴魏熙乐卢梅丽伊国胜 Tianjin Key Laboratory of Process Measurement and Control School of Electrical and Information EngineeringTianjin UniversityTianjin 300072China School of Information Technology Engineering Tianjin University of Technology and EducationTianjin 300222China

Evidences show that electric fields(EFs)induced by the magnetic stimulation could modulates brain activities by regulating the excitability of GABAergic ***,it is still unclear how and why the EF-induced polarization affects the interneuron response as the interneuron receives NMDA synaptic *** the key role of NMDA receptor-mediated supralinear dendritic integration in neuronal computations,we suppose that the applied EFs could functionally modulate interneurons’response via regulating dendritic *** first,we build a simplified multi-dendritic circuit model with inhomogeneous extracellular potentials,which characterizes the relationship among EF-induced spatial polarizations,dendritic integration,and somatic *** performing model-based singular perturbation analysis,it is found that the equilibrium point of fast subsystem can be used to asymptotically depict the subthreshold input–output(sI/O)relationship of dendritic *** predicted that EF-induced strong depolarizations on the distal dendrites reduce the dendritic saturation output by reducing driving force of synaptic input,and it shifts the steep change of sI/O curve left by reducing stimulation threshold of triggering NMDA ***,the EF modulation prefers the global dendritic integration with asymmetric scatter distribution of NMDA ***,we identify the respective contribution of EF-regulated dendritic integration and EF-induced somatic polarization to an action potential generation and find that they have an antagonistic effect on AP generation due to the varied NMDA spike threshold under EF stimulation.

关键词： GABAergic interneuron electrical field supralinear dendritic integration action potential generation

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Microwave Photonics-Based Small Hydrostatic Pressure Sensing Assisted by Convolutional Neural Network

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IEEE Sensors Journal 2025年第11期25卷 20948-20955页

作者： Li, Songlin Xue, Ting Wu, Yan Li, Zhuping Wu, Bin Tianjin University Tianjin Key Laboratory of Process Measurement and Control School of Electrical and Information Engineering Tianjin300072 China Tianjin University State Key Laboratory of Precision Measuring Technology and Instruments Tianjin300072 China

Hydrostatic pressure measurement is essential in many industries, such as oil and gas production, chemical processing, and environmental monitoring. Due to the minimal impact of small hydrostatic pressure on ordinary silica optical fibers, research on its measurement utilizing optical fiber sensing technology remains limited. In this paper, a novel microwave photonics technique, termed optical carrier-based microwave interferometry (OCMI), is utilized for small hydrostatic pressure sensing with the assistance of a convolutional neural network (CNN). The theory of OCMI-based phase demodulation is established, and numerical simulations are conducted to investigate the factors affecting the axial displacement of the fiber core. In practical experiments, the phase demodulation method is applied to small hydrostatic pressure measurements;however, the results are suboptimal. Therefore, the CNN is developed to assist in the implementation of accurate small hydrostatic pressure sensing. The small hydrostatic pressures predicted by the well-trained CNN model are in good agreement with the actual values, with an error of less than 0.25 kPa. In addition, the prediction results from multiple Fabry-Perot interferometers demonstrate the feasibility and effectiveness of utilizing CNN for OCMI-based small hydrostatic pressure sensing. The introduction of machine learning broadens the application scope of the OCMI technique, allowing it to be employed for distributed sensing of a wider range of physical, chemical, and biological quantities. © 2001-2012 IEEE.

关键词： Interferometry

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Gas Evolution Monitoring in Lithium Batteries Based on Nonlinear Ultrasound Technique 43

Gas Evolution Monitoring in Lithium Batteries Based on Nonli...

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43rd Chinese control Conference, CCC 2024

作者： Liu, Shihao Bao, Yong Tan, Chao Tianjin University Tianjin Key Laboratory of Process Measurement and Control School of Electrical and Information Engineering Tianjin300072 China

ISBN: (纸本)9789887581581

Recently, there has been renewed interest in gas evolution monitoring in Lithium Batteries. Accurate gas evolution monitoring helps to gain insight information for safety, efficiency, and the degradation of the battery. Due to the advantage of low cost, efficiency, and high sensitivity to material changes, various ultrasound-based techniques have been developed for gas evolution monitoring. However, these ultrasonic monitoring techniques, using travel-time or waveform amplitude measurement, cannot resolve small gas volume changes below the dead volume for early warning. In this paper, a novel gas evolution monitoring method based on the nonlinear ultrasound theory has been studied. With the use of high-intensity ultrasound excitation, the second harmonic amplitude, generated due to ultrasound nonlinear effect, can be used to detect the presence of bubbles. Numerical simulation has been conducted to validate the performance of the proposed nonlinear ultrasonic gas evolution monitoring method. Results indicate that the nonlinear ultrasonic method has a higher spatial resolution for gas evolution detection in lithium batteries. © 2024 Technical Committee on control Theory, Chinese Association of Automation.

关键词： Lithium batteries

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Investigation on Slug Flow Parameters Based on PIV Phase Discrimination

Investigation on Slug Flow Parameters Based on PIV Phase Dis...

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2023 Tianjin University-IET Electrical and Information Engineering Doctoral Forum, TJU IET 2023

作者： Wang, Haixia Xue, Ting College of Electrical and Information Engineering Tianjin Key Laboratory of Process Measurement and Control Tianjin University Tianjin China

ISBN: (纸本)9781839539824

Investigation of synchronously acquiring multiple parameters holds valuable insights into flow characteristics. When employing particle image velocimetry in gas-liquid slug flow, the integration of phase discrimination assumes an unequivocal role. This not only facilitates the separation of gas and liquid phases to distinctly capture velocity field distributions but also enables the extraction of characteristic parameters beyond velocity from gas or liquid phase. In this study, in addition to velocity measurements employing particle image velocimetry, structural parameters measurement methodologies within slug flow, such as liquid film thickness and elongated bubble length, are introduced based on phase discrimination results. By leveraging the inherent relationships among flow rate parameters, the measurement parameters are cross-validated based on experimental findings to assess the feasibility of the method. Ultimately, an exploration and analysis of flow characteristics in slug flow under different flow conditions are undertaken. © The Institution of Engineering & Technology 2023.

关键词： Velocity measurement

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Investigation of Elongated Bubble Centring in Slug Flow Based on Image processing 42

Investigation of Elongated Bubble Centring in Slug Flow Base...

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42nd Chinese control Conference, CCC 2023

作者： Xue, Ting Yuan, Yuqing College of Electrical and Information Engineering Tianjin University Tianjin Key Laboratory of Process Measurement and Control Tianjin300072 China

ISBN: (纸本)9789887581543

The intermittent slug flow in horizontal circular pipes occurs commonly in industrial applications such as pipeline transportation and nuclear reactor cooling. The phenomenon of elongated bubble centring in slug flow can affect the bubble interface morphology, resulting in fluctuations of characteristic parameters. Therefore, it is important to acknowledge the extent to which bubble centring occurs and the possible influencing factors. This paper aims to investigate the elongated bubble centring in moderately sized pipes based on the laser-induced fluorescence method. A new image processing procedure is developed to measure the centring degree. A novel segmentation method is proposed to improve measurement accuracy by combining the global threshold algorithm with the Grey Wolf Optimization. The statistical analysis shows a positive correlation between the Froude number and the degree of bubble centring. Furthermore, the effect of superficial flow rate ratios is explored in the cases of similar Froude numbers. Finally, the results are verified by the models and the experimental data previously published. © 2023 Technical Committee on control Theory, Chinese Association of Automation.

关键词： Image processing

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Multi-Block Integrated Monitoring of Gas-Liquid Two-Phase Flow Based on Conductance Signal Analysis 42

Multi-Block Integrated Monitoring of Gas-Liquid Two-Phase Fl...

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42nd Chinese control Conference, CCC 2023

作者： Li, Zhao Zhang, Shumei Tan, Chao Dong, Feng School of Electrical and Information Engineering Tianjin Key Laboratory of Process Measurement and Control Tianjin University Tianjin300072 China

ISBN: (纸本)9789887581543

The state monitoring of gas-liquid two-phase flow with complex and diverse structures is the key to ensure the safe and stable operation of related industrial production. In order to achieve effective monitoring with limited sensing equipment, a multi-block integrated monitoring strategy for gas-liquid two-phase flow based on conductance signal analysis in time, frequency and multiscale domain is proposed. Three-block information including water holdup in time-domain, continuous wavelet transforms (CWT) based coarse scale approximation (CSA) coefficients in frequency-domain and CWT based local wavelet energy (LWE) coefficient maps in multiscale-domain are used for block-based modeling and monitoring. Considering the original structure of each block, the traditional principal component analysis (PCA) is adopted to model and monitor 1-D information including water holdup and CSA coefficients, while the tensor PCA is adopted for the 2-D LWE coefficient map. Three-block monitoring results are integrated through Bayesian inference to realize final monitoring. The dynamic experiment results demonstrate that the proposed multi-block integrated monitoring outperforms single-block information monitoring. © 2023 Technical Committee on control Theory, Chinese Association of Automation.

关键词： Principal component analysis

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Principal Polynomial Analysis Based Status Monitoring for Gas-Liquid Two-Phase Flow in Horizontal Pipe 42

Principal Polynomial Analysis Based Status Monitoring for Ga...

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42nd Chinese control Conference, CCC 2023

作者： Zhang, Liyuan Wu, Wentao Dong, Feng School of Electrical and Information Engineering Tianjin University Tianjin Key Laboratory of Process Measurement and Control Tianjin300072 China

ISBN: (纸本)9789887581543

As a kind of flow process with complex and variable flow structure, multiple process variables and nonlinear characteristics, the flow status of multiphase flow shows non-stationary characteristics, and it is difficult to achieve accurate online monitoring. For the nonlinear characteristics of the flow status of gas-liquid two-phase flow, a monitoring method based on principal polynomial analysis is proposed to extract the nonlinear characteristics of the flow status information. This method performs dimensionality reduction in multiple steps and uses polynomials for feature fitting, which can fully extract flow status information. Multiple sensors are used to obtain data representing different fluctuation characteristics in the flow process, models of different flow statuses are established, and status monitoring is realized based on statistical indicators. In the comparison with the principal component analysis method, it can be found that the principal polynomial analysis method can extract the nonlinear features and can describe the flow status more comprehensively, which can improve the accuracy of status monitoring. © 2023 Technical Committee on control Theory, Chinese Association of Automation.

关键词： Polynomials

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